void
ShmHolder::renderFrame(VideoFrame& src) noexcept
{
const auto width = src.width();
const auto height = src.height();
const auto format = VIDEO_PIXFMT_BGRA;
const auto frameSize = videoFrameSize(format, width, height);
if (!resizeArea(frameSize)) {
RING_ERR("ShmHolder[%s]: could not resize area",
openedName_.c_str());
return;
}
{
VideoFrame dst;
VideoScaler scaler;
dst.setFromMemory(area_->data + area_->writeOffset, format, width, height);
scaler.scale(src, dst);
}
{
SemGuardLock lk {area_->mutex};
++area_->frameGen;
std::swap(area_->readOffset, area_->writeOffset);
::sem_post(&area_->frameGenMutex);
}
}
void SHMSink::render_frame(VideoFrame& src)
{
VideoFrame dst;
VideoScaler scaler;
const int width = src.getWidth();
const int height = src.getHeight();
const int format = VIDEO_PIXFMT_BGRA;
size_t bytes = dst.getSize(width, height, format);
shm_lock();
if (!resize_area(sizeof(SHMHeader) + bytes)) {
ERROR("Could not resize area");
return;
}
dst.setDestination(shm_area_->data, width, height, format);
scaler.scale(src, dst);
#ifdef DEBUG_FPS
const std::chrono::time_point<std::chrono::system_clock> currentTime = std::chrono::system_clock::now();
const std::chrono::duration<double> seconds = currentTime - lastFrameDebug_;
frameCount_++;
if (seconds.count() > 1) {
DEBUG("%s: FPS %f", shm_name_.c_str(), frameCount_ / seconds.count());
frameCount_ = 0;
lastFrameDebug_ = currentTime;
}
#endif
shm_area_->buffer_size = bytes;
shm_area_->buffer_gen++;
sem_post(&shm_area_->notification);
shm_unlock();
}